An engineer is trying to determine how much counterweight she needs to use in order to lift a 22K load (at the position shown). Assume her crane has a 5K chassis but all other parts of the crane, besides the counterweight, have negligible weight. Answer all questions relative to the rotation point. How much torque is caused by the load? How much torque is caused by the chassis? How much counterweight would "barely balance" the crane?

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An engineer is trying to determine how much counterweight she needs to use in order to lift a 22K load (at the position shown). Assume her crane has a 5K chassis but all other parts of the crane, besides the counterweight, have negligible weight. Answer all questions relative to the rotation point.

How much torque is caused by the load?

How much torque is caused by the chassis?

How much counterweight would "barely balance" the crane?

Could the crane successfully lift the load using each of the following counterweights?

30K yes or no

40K yes or no

50K yes or no

60K yes or no

**Mobile Crane Diagram**

This diagram illustrates a mobile crane with several labeled components. The purpose of the diagram is to provide a clear understanding of the structural elements and operational mechanics involved in the functioning of a mobile crane.

**Key Components:**

1. **Chassis:** 
   - This is the base structure of the crane, providing support and stability. It includes wheels to facilitate transportation.

2. **Counter Weight:**
   - Located at the rear of the crane, the counter weight is crucial for balancing the load being lifted by the crane, preventing it from tipping over.

3. **Load:**
   - This represents the object or material being lifted by the crane. In this diagram, the load is situated 5 feet away from the boom tip.

4. **Boom:**
   - An extendable and adjustable arm of the crane used to lift and move loads. The boom in the diagram is set at an angle to lift the load.

5. **Operator Cabin:**
   - Marked with the "BARNHART" label, this is where the crane operator controls and maneuvers the crane.

6. **Block and Hook:**
   - The block extends the hook, which is used to grab and lift the load. The block provides mechanical advantage by transforming rotational motion into lifting motion.

**Diagrams and Measurements:**

- The background grid likely serves to provide a scale for understanding distances and dimensions within the diagram. 
- A vertical distance marker labeled "5 ft" is placed beside the load, indicating the lifting height from a reference point, possibly the ground.

Understanding how these components interact is key to safely and effectively operating a mobile crane. Proper knowledge of the load balance, counter weights, and the structure of the boom can prevent accidents and enhance operational efficiency.
Transcribed Image Text:**Mobile Crane Diagram** This diagram illustrates a mobile crane with several labeled components. The purpose of the diagram is to provide a clear understanding of the structural elements and operational mechanics involved in the functioning of a mobile crane. **Key Components:** 1. **Chassis:** - This is the base structure of the crane, providing support and stability. It includes wheels to facilitate transportation. 2. **Counter Weight:** - Located at the rear of the crane, the counter weight is crucial for balancing the load being lifted by the crane, preventing it from tipping over. 3. **Load:** - This represents the object or material being lifted by the crane. In this diagram, the load is situated 5 feet away from the boom tip. 4. **Boom:** - An extendable and adjustable arm of the crane used to lift and move loads. The boom in the diagram is set at an angle to lift the load. 5. **Operator Cabin:** - Marked with the "BARNHART" label, this is where the crane operator controls and maneuvers the crane. 6. **Block and Hook:** - The block extends the hook, which is used to grab and lift the load. The block provides mechanical advantage by transforming rotational motion into lifting motion. **Diagrams and Measurements:** - The background grid likely serves to provide a scale for understanding distances and dimensions within the diagram. - A vertical distance marker labeled "5 ft" is placed beside the load, indicating the lifting height from a reference point, possibly the ground. Understanding how these components interact is key to safely and effectively operating a mobile crane. Proper knowledge of the load balance, counter weights, and the structure of the boom can prevent accidents and enhance operational efficiency.
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